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Management and climate contributions to satellite-derived active fire trends in the contiguous United States.

Lin HW, McCarty JL, Wang D, Rogers BM, Morton DC, Collatz GJ, Jin Y, Randerson JT - J Geophys Res Biogeosci (2014)

Bottom Line: Large wildland fires were the most variable of all three fire types and had no significant annual trend in the contiguous U.S. during 2001-2010.In the west, cropland active fires decreased at a rate of 5.9% per year, likely in response to intensive air quality policies.Wildland, cropland, and prescribed fires had different trends and patternsSensitivity to climate varied with fire typeIntensity of air quality regulation influenced cropland burning trends.

View Article: PubMed Central - PubMed

Affiliation: Department of Earth System Science, University of California Irvine, California, USA.

ABSTRACT

: Fires in croplands, plantations, and rangelands contribute significantly to fire emissions in the United States, yet are often overshadowed by wildland fires in efforts to develop inventories or estimate responses to climate change. Here we quantified decadal trends, interannual variability, and seasonality of Terra Moderate Resolution Imaging Spectroradiometer (MODIS) observations of active fires (thermal anomalies) as a function of management type in the contiguous U.S. during 2001-2010. We used the Monitoring Trends in Burn Severity database to identify active fires within the perimeter of large wildland fires and land cover maps to identify active fires in croplands. A third class of fires defined as prescribed/other included all residual satellite active fire detections. Large wildland fires were the most variable of all three fire types and had no significant annual trend in the contiguous U.S. during 2001-2010. Active fires in croplands, in contrast, increased at a rate of 3.4% per year. Cropland and prescribed/other fire types combined were responsible for 77% of the total active fire detections within the U.S and were most abundant in the south and southeast. In the west, cropland active fires decreased at a rate of 5.9% per year, likely in response to intensive air quality policies. Potential evaporation was a dominant regulator of the interannual variability of large wildland fires, but had a weaker influence on the other two fire types. Our analysis suggests it may be possible to modify landscape fire emissions within the U.S. by influencing the way fires are used in managed ecosystems.

Key points: Wildland, cropland, and prescribed fires had different trends and patternsSensitivity to climate varied with fire typeIntensity of air quality regulation influenced cropland burning trends.

No MeSH data available.


Related in: MedlinePlus

(a) Map of fire management classes identified for different states in CONUS. The intensity of fire management increases from class 1 to class 4. (b) Interannual variations in cropland fires normalized by the principal crop area planted within each management class. (c) Monthly distribution of the active fires within each management class (solid line) and long-term trends (dashed line).
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fig09: (a) Map of fire management classes identified for different states in CONUS. The intensity of fire management increases from class 1 to class 4. (b) Interannual variations in cropland fires normalized by the principal crop area planted within each management class. (c) Monthly distribution of the active fires within each management class (solid line) and long-term trends (dashed line).

Mentions: We identified fire regulations and laws in 22 of 48 lower U.S. states, of which we grouped into four fire policy classes based on whether reporting of open burning is required and whether there are specific cropland burning policies (Figure 9a). A description of state-level law articles, regulation systems, and a list of states in each fire policy class are summarized in Table S1. Western states had the highest intensity of fire management policy (class 4), whereas states in other regions often had intermediate levels of intensity (classes 1–3).


Management and climate contributions to satellite-derived active fire trends in the contiguous United States.

Lin HW, McCarty JL, Wang D, Rogers BM, Morton DC, Collatz GJ, Jin Y, Randerson JT - J Geophys Res Biogeosci (2014)

(a) Map of fire management classes identified for different states in CONUS. The intensity of fire management increases from class 1 to class 4. (b) Interannual variations in cropland fires normalized by the principal crop area planted within each management class. (c) Monthly distribution of the active fires within each management class (solid line) and long-term trends (dashed line).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4508926&req=5

fig09: (a) Map of fire management classes identified for different states in CONUS. The intensity of fire management increases from class 1 to class 4. (b) Interannual variations in cropland fires normalized by the principal crop area planted within each management class. (c) Monthly distribution of the active fires within each management class (solid line) and long-term trends (dashed line).
Mentions: We identified fire regulations and laws in 22 of 48 lower U.S. states, of which we grouped into four fire policy classes based on whether reporting of open burning is required and whether there are specific cropland burning policies (Figure 9a). A description of state-level law articles, regulation systems, and a list of states in each fire policy class are summarized in Table S1. Western states had the highest intensity of fire management policy (class 4), whereas states in other regions often had intermediate levels of intensity (classes 1–3).

Bottom Line: Large wildland fires were the most variable of all three fire types and had no significant annual trend in the contiguous U.S. during 2001-2010.In the west, cropland active fires decreased at a rate of 5.9% per year, likely in response to intensive air quality policies.Wildland, cropland, and prescribed fires had different trends and patternsSensitivity to climate varied with fire typeIntensity of air quality regulation influenced cropland burning trends.

View Article: PubMed Central - PubMed

Affiliation: Department of Earth System Science, University of California Irvine, California, USA.

ABSTRACT

: Fires in croplands, plantations, and rangelands contribute significantly to fire emissions in the United States, yet are often overshadowed by wildland fires in efforts to develop inventories or estimate responses to climate change. Here we quantified decadal trends, interannual variability, and seasonality of Terra Moderate Resolution Imaging Spectroradiometer (MODIS) observations of active fires (thermal anomalies) as a function of management type in the contiguous U.S. during 2001-2010. We used the Monitoring Trends in Burn Severity database to identify active fires within the perimeter of large wildland fires and land cover maps to identify active fires in croplands. A third class of fires defined as prescribed/other included all residual satellite active fire detections. Large wildland fires were the most variable of all three fire types and had no significant annual trend in the contiguous U.S. during 2001-2010. Active fires in croplands, in contrast, increased at a rate of 3.4% per year. Cropland and prescribed/other fire types combined were responsible for 77% of the total active fire detections within the U.S and were most abundant in the south and southeast. In the west, cropland active fires decreased at a rate of 5.9% per year, likely in response to intensive air quality policies. Potential evaporation was a dominant regulator of the interannual variability of large wildland fires, but had a weaker influence on the other two fire types. Our analysis suggests it may be possible to modify landscape fire emissions within the U.S. by influencing the way fires are used in managed ecosystems.

Key points: Wildland, cropland, and prescribed fires had different trends and patternsSensitivity to climate varied with fire typeIntensity of air quality regulation influenced cropland burning trends.

No MeSH data available.


Related in: MedlinePlus